[EXP] Getting the pixel position of a window point

[ This is experimental, and thus is not (yet) being submitted to xemacs-patches. ] Here's an experimental patch for 21.2 that provides a way of getting the window pixel co-ordinates of a window point. I found that the function, "current-pixel-column", already existed, and so I just added the corresponding function, "current-pixel-row". However, there's a big "gotcha" (issue) with these functions: they both use the redisplay tables to determine the pixel position. This basically means that a screen update/refresh must be done (e.g., "(sit-for 0)") before these functions will return correct values. For newly-created frames, you have to do something like this instead: ;; idea stolen from set-mouse-position (while (not (frame-visible-p frame)) (sleep-for .5)) Unfortunately, there doesn't seem to be a better way. Jonathan Harris <jhar(a)tardis.ed.ac.uk&gt; suggested the use of "glyph_to_pixel_translation()". The problem with this is that you need to provide the desired row and column, and there's no easy way to get the row/column of a window point. Also, glyph_to_pixel_translation() still depends on the redisplay tables being up-to-date. Because of all this, I decided to simply extend "current-pixel-column". Comments? I'll send a patch to xemacs-patches if I don't hear anything. -- Darryl Okahata darrylo(a)soco.agilent.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Agilent Technologies, or of the little green men that have been following him all day.